Johan Knel (Büchner) was an Anabaptist martyr, burned at the stake in London on 2 May 1550, with Anna Cantiana, because they believed "with Menno Simons . . . that the Son of God . . . did not receive His humanity from Mary."

Braght, Thieleman J. van. The Bloody Theatre or Martyrs' Mirror of the Defenseless Christians Who Baptized Only upon Confession of Faith and Who Suffered and Died for the Testimony of Jesus Their Saviour . . . to the Year A.D. 1660. Scottdale, PA: Herald Press, 1951: 498. Available online at: http://www.homecomers.org/mirror/index.htm.